Rocker Switches

index.html

<main>
	<div class="col">
		<label>
			<span class="switch">
				<input class="switch__input" type="checkbox" role="switch">
				<span class="switch__surface">
					<span class="switch__surface-glare"></span>
				</span>
				<span class="switch__inner-shadow"></span>
				<span class="switch__inner">
					<span class="switch__inner-glare"></span>
				</span>
				<span class="switch__rocker-shadow"></span>
				<span class="switch__rocker-sides">
					<span class="switch__rocker-sides-glare"></span>
				</span>
				<span class="switch__rocker">
					<span class="switch__rocker-glare"></span>
				</span>
				<span class="switch__light">
					<span class="switch__light-inner"></span>
				</span>
			</span>
			<span class="sr">Light Switch</span>
		</label>
	</div>
	<div class="col col--dark">
		<label>
			<span class="switch">
				<input class="switch__input" type="checkbox" role="switch">
				<span class="switch__surface">
					<span class="switch__surface-glare"></span>
				</span>
				<span class="switch__inner-shadow"></span>
				<span class="switch__inner">
					<span class="switch__inner-glare"></span>
				</span>
				<span class="switch__rocker-shadow"></span>
				<span class="switch__rocker-sides">
					<span class="switch__rocker-sides-glare"></span>
				</span>
				<span class="switch__rocker">
					<span class="switch__rocker-glare"></span>
				</span>
				<span class="switch__light">
					<span class="switch__light-inner"></span>
				</span>
			</span>
			<span class="sr">Dark Switch</span>
		</label>
	</div>
</main>

rocker-switches.markdown

Rocker Switches

Realistic-looking CSS rocker switches with an LED light shown in light and dark schemes.

A Pen by Allen Goodreds on CodePen.

License.

style.css

* {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root {
	--hue: 223;
	--fg: hsl(var(--hue),10%,10%);
	--trans-dur: 0.3s;
	--trans-timing: cubic-bezier(0.83, 0, 0.17, 1);
	font-size: calc(30px + (60 - 30) * (100vw - 320px) / (2560 - 320));
}
body,
input {
	color: var(--fg);
	font: 1em/1.5 sans-serif;
}
body {
	display: flex;
	height: 100vh;
}
main,
label,
.col {
	display: flex;
}
main {
	flex-direction: column;
	width: 100%;
}
label {
	align-items: center;
	margin: auto;
	-webkit-tap-highlight-color: transparent;
}
.col {
	background-color: hsl(var(--hue),10%,90%);
	background-image: linear-gradient(hsla(0,0%,0%,0),hsla(0,0%,0%,0.4));
	padding: 1.5em;
	width: 100%;
	height: 100%;
}
.sr {
	overflow: hidden;
	position: absolute;
	width: 1px;
	height: 1px;
}

/* Light theme */
.switch,
.switch__input {
	display: block;
}
.switch {
	border-radius: 1.5em;
	box-shadow: 0 0.125em 0.25em hsla(0,0%,0%,0.4);
	position: relative;
	width: 4.5em;
	height: 3em;
	perspective: 10em;
}
.switch span {
	display: block;
}
.switch > span {
	border-radius: inherit;
	z-index: 1;
}
.switch__surface-glare,
.switch__inner,
.switch__inner-glare,
.switch__rocker-sides,
.switch__rocker-sides-glare,
.switch__rocker,
.switch__rocker-glare,
.switch__light {
	transition: transform var(--trans-dur) var(--trans-timing);
}
.switch__surface {
	background-color: hsl(var(--hue),10%,83%);
	overflow: hidden;
	width: 100%;
	height: 100%;
}
.switch > .switch__surface {
	z-index: 0;
}
.switch__surface-glare {
	background-image: radial-gradient(50% 50% at center,hsla(var(--hue),10%,90%,1),hsla(var(--hue),10%,90%,0));
	width: 3em;
	height: 3em;
	transform: translate(0,0.125em);
}
.switch__input {
	background-color: hsl(var(--hue),10%,80%);
	border-radius: 1.5em;
	box-shadow: 0 0 0 0.125em hsla(var(--hue),90%,50%,0);
	outline: transparent;
	position: absolute;
	top: 0.0625em;
	left: 0.0625em;
	width: calc(100% - 0.125em);
	height: calc(100% - 0.125em);
	transition: box-shadow 0.15s linear;
	z-index: 1;
	-webkit-appearance: none;
	appearance: none;
	-webkit-tap-highlight-color: transparent;
}
.switch__input:focus-visible {
	box-shadow: 0 0 0 0.125em hsla(var(--hue),90%,50%,1);
}
.switch__inner {
	background-color: hsl(var(--hue),10%,83%);
	overflow: hidden;
	position: absolute;
	inset: 0.5em;
	transform: translate(0.125em,0);
}
.switch__inner-glare {
	background-image: radial-gradient(50% 50% at center,hsla(var(--hue),10%,90%,1),hsla(var(--hue),10%,90%,0));
	position: absolute;
	width: 2em;
	height: 2em;
	transform: translate(100%,-0.5em);
}
.switch__inner-shadow {
	box-shadow: 0 0.125em 0.25em hsla(0,0%,0%,0.4);
	position: absolute;
	inset: 0.5em;
}
.switch__rocker-shadow {
	box-shadow: 0 0.125em 0.25em hsla(0,0%,0%,0.15);
	position: absolute;
	top: 0.5625em;
	right: 0.5625em;
	bottom: 0.5625em;
	left: 0.75em;
}
.switch__rocker-sides {
	background-color: hsl(var(--hue),10%,80%);
	overflow: hidden;
	position: absolute;
	inset: 0.5em;
	transform: rotateY(-20deg) translateZ(0.5em);
	transform-style: preserve-3d;
}
.switch__rocker-sides-glare {
	background-image: linear-gradient(90deg,hsla(var(--hue),10%,85%,0),hsla(var(--hue),10%,85%,1),hsla(var(--hue),10%,85%,0));
	position: absolute;
	width: 200%;
	height: 100%;
}
.switch__rocker {
	background-color: hsl(var(--hue),10%,80%);
	overflow: hidden;
	position: absolute;
	inset: 0.5625em;
	transform: rotateY(-20deg) translateZ(0.5em);
	transform-style: preserve-3d;
}
.switch__rocker-glare {
	background-image: linear-gradient(120deg,hsla(var(--hue),10%,85%,0) 25%,hsla(var(--hue),10%,85%,1) 50%,hsla(var(--hue),10%,85%,0) 75%);
	position: absolute;
	width: 100%;
	height: 100%;
	transform: translateX(-33%);
}
.switch__light {
	background-image: linear-gradient(-45deg,hsl(var(--hue),10%,60%) 30%,hsl(var(--hue),10%,80%));
	box-shadow: 0 0 max(1px,0.05em) hsla(var(--hue),10%,10%,0.3) inset;
	position: absolute;
	top: 50%;
	left: 50%;
	width: 0.5em;
	height: 0.5em;
	transform: translate(-50%,-50%) rotateY(-20deg) translateX(1.125em) translateZ(0.51em);
}
.switch__light-inner {
	background-color: hsl(133,90%,50%);
	box-shadow:
		0 0 max(1px,0.05em) hsla(var(--hue),10%,10%,0.3) inset,
		0 0 0.25em hsl(133,90%,50%);
	border-radius: 50%;
	opacity: 0;
	width: 100%;
	height: 100%;
	transition: opacity var(--trans-dur) var(--trans-timing);
}

/* Dark theme */
.col--dark {
	background-color: hsl(var(--hue),10%,10%);
	color: hsl(var(--hue),10%,90%);
}
.col--dark .switch__surface {
	background-color: hsl(var(--hue),10%,22%);
}
.col--dark .switch__surface-glare {
	background-image: radial-gradient(50% 50% at center,hsla(var(--hue),10%,45%,1),hsla(var(--hue),10%,45%,0));
}
.col--dark .switch__input {
	background-color: hsl(var(--hue),10%,20%);
}
.col--dark .switch__inner {
	background-color: hsl(var(--hue),10%,22%);
}
.col--dark .switch__inner-glare {
	background-image: radial-gradient(50% 50% at center,hsla(var(--hue),10%,45%,1),hsla(var(--hue),10%,45%,0));
}
.col--dark .switch__rocker-shadow {
	box-shadow: 0 0.125em 0.25em hsla(0,0%,0%,0.5);
}
.col--dark .switch__rocker-sides {
	background-color: hsl(var(--hue),10%,20%);
}
.col--dark .switch__rocker-sides-glare {
	background-image: linear-gradient(90deg,hsla(var(--hue),10%,35%,0),hsla(var(--hue),10%,35%,1),hsla(var(--hue),10%,35%,0));
}
.col--dark .switch__rocker {
	background-color: hsl(var(--hue),10%,20%);
}
.col--dark .switch__rocker-glare {
	background-image: linear-gradient(120deg,hsla(var(--hue),10%,25%,0) 25%,hsla(var(--hue),10%,25%,1) 50%,hsla(var(--hue),10%,25%,0) 75%);
}
.col--dark .switch__light {
	background-image: linear-gradient(-45deg,hsl(var(--hue),10%,30%) 30%,hsl(var(--hue),10%,50%));
}

/* “On” state */
.switch__input:checked ~ .switch__surface .switch__surface-glare {
	transform: translate(3em,0.125em);
}
.switch__input:checked ~ .switch__inner {
	transform: translate(-0.125em,0);
}
.switch__input:checked ~ .switch__inner .switch__inner-glare {
	transform: translate(0,-0.5em);
}
.switch__input:checked ~ .switch__rocker {
	transform: rotateY(20deg) translateZ(0.5em);
}
.switch__input:checked ~ .switch__rocker .switch__rocker-glare {
	transform: translateX(33%);
}
.switch__input:checked ~ .switch__rocker-sides {
	transform: rotateY(20deg) translateZ(0.5em);
}
.switch__input:checked ~ .switch__rocker-sides .switch__rocker-sides-glare {
	transform: translateX(-50%);
}
.switch__input:checked ~ .switch__light {
	transform: translate(-50%,-50%) rotateY(20deg) translateX(1.125em) translateZ(0.51em);
}
.switch__input:checked ~ .switch__light .switch__light-inner {
	opacity: 1;
}

/* Viewports beyond mobile */
@media (min-width: 768px) {
	main {
		flex-direction: row;
	}
}